linux-kernel - Re: [PATCH] 3/3 maple: update bus driver to support Dreamcast VMU

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Date:	Mon, 24 Mar 2008 17:04:30 +0100
From:	Jörn Engel <joern@...fs.org>
To:	Adrian McMenamin <adrian@...golddream.dyndns.info>
Cc:	Paul Mundt <lethal@...ux-sh.org>, Greg KH <greg@...ah.com>,
	dwmw2 <dwmw2@...radead.org>, LKML <linux-kernel@...r.kernel.org>,
	MTD <linux-mtd@...ts.infradead.org>,
	linux-sh <linux-sh@...r.kernel.org>,
	Andrew Morton <akpm@...l.org>
Subject: Re: [PATCH] 3/3 maple: update bus driver to support Dreamcast VMU

On Mon, 24 March 2008 15:51:40 +0000, Adrian McMenamin wrote:
> On Mon, 2008-03-24 at 16:29 +0100, Jörn Engel wrote:
> > On Mon, 24 March 2008 15:06:18 +0000, Adrian McMenamin wrote:
> > > 
> > > I don't think I have any alternative here. The problem is that the bus
> > > checks periodically (every HZ ticks but that could be changed) if a
> > > device remains connected to the system by queueing a status command. (If
> > > the status command is replied to with a "No response" then that
> > > indicates to the bus that the device has been removed.
> > 
> > Where does this queueing happen?  Somewhere in the kernel where we can
> > control it or in hardware?
> 
> Well, the queuing of the status command is under software control.

Then we should be fine.  I'll try to beat the code into submission.

Jörn

-- 
Joern's library part 7:
http://www.usenix.org/publications/library/proceedings/neworl/full_papers/mckusick.a
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